Includes integration test.

Resolves VUFIND-663.

Renamed 'logger' service to 'VuFind\Logger' to avoid conflicts; updated all logger-dependent classes to use Zend\Log\LoggerAwareInterface; set up standard initializer for main service manager and other factories.

Prefixed plugin manager service names with "VuFind\" as first step toward best-practice naming for global services.

Use explicit dependency injection for ILS authentication module instead of relying on service locator.

Split searchspecs reading away from standard config reader; made new class non-static for service manager integration; updated tests to match.

This class extends \PHPUnit_Framework_TestCase and implements three
methods to access private and protected methods and properties.

callMethod(OBJECT-OR-CLASS, METHOD, ARGUMENTS)
getProperty(OBJECT-OR-CLASS, PROPERTY)
setProperty(OBJECT-OR-CLASS, PROPERTY, VALUE)